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Flash Memory Controller
6.9
Security
This family of devices include circuitry to prevent unauthorized access to the contents of flash memory.
When security is engaged, BDM control/communication with the CPU is extremely limited. Read/Write
access via BDM is then limited to XCSR[31–24], CSR2[31–24].
It is possible to check STOP/HALT status of the CPU, enable BDM clocks, configure reset behavior and
assert reset.
Table 6-5. CPU resources available via BDM In Secure mode
Register
XCSR[31]
XCSR[30]
XCSR[29:27]
XCSR[26]
XCSR[25]
XCSR[24]
CSR2[31]
CSR2[30]
CSR2[29]
CSR2[28]
CSR2[27]
CSR2[26]
CSR2[25]
CSR2[24]
Field
CPU_HALT
CPU_STOP
CSTAT
CLKSW
SEC
ENBDM
PSTBP
RESERVED
COPHR
IOPHR
IADHR
RESERVED
BFHBR
BDFR
Access
R
R
R
R/W
R/W
R/W
R
N/A
R/W
R/W
R/W
N/A
R/W
W
Function
1, if CPU is Halted
1, if CPU is in STOP mode
BDM Command Status
BDM Clock Select (no function on the device)
Security Status (1 = Secured)
Enable BDM (1 = BDM is enabled)
PST Buffer Stop
COP halt after reset (no function on the device)
Illegal Operation halt after reset
Illegal Address halt after reset
BDM force halt on BDM reset
Background debug force reset
Security is engaged or disengaged based on the state of nonvolatile register bits shown in FOPT[SSC].
During the reset sequence, the contents in bits 7:0 of the nonvolatile location NVOPT ($3FFF) are copied
from flash into bits 7:0 of the working FOPT register. A user engages security by programming the
NVOPT location which can be done at the same time that the flash memory is programmed.
Notice the erased state (SSC = 11b) makes the MCU unsecure. When SSC bits of NVOPT are programmed
to SECURE (10b), the next reset will engage security. In order to permanently disengage security, the
NVOPT bits must be erased. Security can be disengaged by a software interrupt (SWI) that will switch the
MMA955xL platform to Supervisor mode. The SWI should perform the following functions:
1. If necessary, set PROTB = 1b.
2. Mass-erase the flash and verify that the contents have been erased.
3. Set SSC = 11b, assuming verify passed.
4. Return.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
69
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